/Engine/Source/Runtime/Engine/Classes/Engine/HLODProxy.h
Adds a static mesh and the key used to generate it
void AddMesh ( [ALODActor](API\Runtime\Engine\Engine\ALODActor) * InLODActor, [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * InStaticMesh, const [FName](API\Runtime\Core\UObject\FName) & InKey )